Neuroplasticity And Provigil

I'm interested in trying Provigil because of the large mental loads that I'm facing these days. It is my intention to only use the drug short term, and to gain as much knowledge and (hopefully) cognition while on it. Obviously, the knowledge you earn while on Provigil stays with you when you stop taking it, but what I'm also wondering about is cognition. I don't expect Provigil by itself to improve neuroplasticity, but theoretically it should increase my focus so that I can spend more time and do better on cognitive challenges like Duel N Back. Would that permanently effect my neuroplasticity in a positive way, or would there be no difference in cognition once I stop taking the drug?